Bootstrapify button.
Fixed some docblocks.
jstree added, closes #1752
Merge pull request #1848 from phaidon/jstree

jstree added, closes #1752
Corrected function name.
Fixed error introduced in recent commit - also check the value of $readOnly and not existance only.
Merge pull request #1849 from cmfcmf/minor-fixes

Several minor fixes
fixed table header tags. refs #1831
Merge pull request #1852 from rojblake/perm_fix

fixed table header tags. refs #1831
update DOCS to highlight emphasis on maintaining BC while clearly outlining where BC has been broken. refs #1002, #1261
add information about routes in javascript
correct bold formatting
Also find getter methods named `isField()` and not only `getField()`.
Throw \RuntimeException's if a getter or setter is missing.
fix typo in event response
remove old unused code (already replaced)
refactor response from `frontcontroller.exception` to `KernelEvents::EXCEPTION`
refactor opensearch event response from `frontcontroller.predispatch` to `KernelEvents::REQUEST`
move removed events to deprecated area of docs
Moved admincategory setting into event listener.